The three levels are similar. Tsinghua Peking University is directly under the Ministry of Education and China University of Science and Technology is directly under the China Academy of Sciences. The basic subjects of China University of Science and Technology, such as mathematics and physics, are better. Tsinghua is good at engineering, and the civil electronics, machinery, medicine and other scientific disciplines are top-notch. Physics is good, and Peking University has strong legal literature, such as legal literature and history, biochemistry of science and geology of Peking University. It is not enough to engage in scientific research only at the undergraduate stage, but also to study for a postgraduate degree, get a doctorate, or even go abroad to study for a doctorate, because in China, no matter whether you enter a scientific research institute or be a university professor, you need a doctorate, and the better scientific research institutions and universities have higher requirements for academic qualifications.